[EuiPagination] Each child in a list should have a unique "key" prop

[weronikaolejniczak]

The purpose of this task is to investigate and fix a console warning in EuiPagination. The issue is reproducible in Kibana for document flyout in Discover.

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Stack trace:

Warning: Each child in a list should have a unique "key" prop

hook.js:608 Warning: Each child in a list should have a unique "key" prop. See https://reactjs.org/link/warning-keys for more information. Error Component Stack
  at EuiI18n (<anonymous>)
  at div (<anonymous>)
  at nav (<anonymous>)
  at div (<anonymous>)
  at div (<anonymous>)
  at div (<anonymous>)
  at div (<anonymous>)
  at div (<anonymous>)
  at UnifiedDocViewerFlyout (doc_viewer_flyout.tsx:41:1)
  at Suspense (<anonymous>)
  at with_suspense.tsx:26:1
  at DiscoverGridFlyout (discover_grid_flyout.tsx:25:1)
  at Suspense (<anonymous>)
  at with_suspense.tsx:26:1
  at span (<anonymous>)
  at UnifiedDataTable (data_table.tsx:62:1)
  at DiscoverGrid (discover_grid.tsx:20:1)
  at CellActionsProvider (cell_actions_context.tsx:15:1)
  at div (<anonymous>)
  at div (<anonymous>)
  at DiscoverDocumentsComponent (discover_documents.tsx:73:1)
  at div (<anonymous>)
  at div (<anonymous>)
  at DropOverlayWrapper (drop_overlay_wrapper.tsx:28:1)
  at SingleDropInner (droppable.tsx:241:1)
  at div (<anonymous>)
  at DroppableImpl (droppable.tsx:56:1)
  at Droppable (droppable.tsx:34:1)
  at DiscoverMainContent (discover_main_content.tsx:39:1)
  at UnifiedHistogramLayout (layout.tsx:26:1)
  at container.tsx:35:1
  at Suspense (<anonymous>)
  at with_suspense.tsx:26:1
  at DiscoverHistogramLayout (discover_histogram_layout.tsx:33:1)
  at div (<anonymous>)
  at div (<anonymous>)
  at DiscoverResizableLayout (discover_resizable_layout.tsx:19:1)
  at div (<anonymous>)
  at div (<anonymous>)
  at div (<anonymous>)
  at DiscoverLayout (discover_layout.tsx:60:1)
  at ChildDragDropProvider (providers.tsx:211:1)
  at RootDragDropProvider (providers.tsx:138:1)
  at DiscoverMainApp (discover_main_app.tsx:26:1)
  at BaseAppWrapper (use_root_profile.tsx:49:1)
  at DiscoverMainProvider (discover_state_provider.tsx:44:1)
  at DiscoverMainRoute (discover_main_route.tsx:36:1)
  at Route (route.tsx:26:1)
  at Routes (routes.tsx:18:1)
  at DiscoverRoutes (discover_router.tsx:49:1)
  at Router (router.tsx:29:1)
  at Provider (context.tsx:43:1)
  at DiscoverRouter (discover_router.tsx:24:1)
  at I18nContext (i18n_service.tsx:36:1)
  at KibanaEuiProvider (eui_provider.tsx:56:1)
  at KibanaRootContextProvider (root_provider.tsx:34:1)
  at KibanaRenderContextProvider (render_provider.tsx:22:1)

More context: elastic/kibana#202287 (comment)